Transcription of Natural Convection
{{id}} {{{paragraph}}}
Example: dental hygienist
Natural Convection
M. Bahrami ENSC 388 (F09) Natural Convection 1 Natural Convection In Natural Convection , the fluid motion occurs by Natural means such as buoyancy . Since the fluid velocity associated with Natural Convection is relatively low, the heat transfer coefficient encountered in Natural Convection is also low. Mechanisms of Natural Convection Consider a hot object exposed to cold air. The temperature of the outside of the object will drop (as a result of heat transfer with cold air), and the temperature of adjacent air to the object will rise. Consequently, the object is surrounded with a thin layer of warmer air and heat will be transferred from this layer to the outer layers of air. Fig. 1: Natural Convection heat transfer from a hot body. The temperature of the air adjacent to the hot object is higher, thus its density is lower.
the body. This is known as Archimedes’ principle. We all encounter the feeling of “weight loss” in water which is caused by the buoyancy force. Other examples are hot balloon rising, and the chimney effect. Note that the buoyancy force needs the …
Loading..
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: